Electrical controller for motor-driven devices



March 16 1926, 1,577,068

F. H. OBERSCHMIDT ELECTRICAL CONTROLLER FOR MOTOR DRIVEN DEVICES Filed April 28, 1924 a 1N VIiNTQR dwedM wk H02 v I I A TTORNEY tion of its circuit, failure of the Patented Mar. 16, 1926.

enses UNITED STATES PATENT OFFICE.

FREDERICK H. OBERSCI-IMIDT, OF GLEVELAND, OHIO, ASSIGNOR TO THE CUTLER- MFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

ELECTRICAL CONTROLLER FOR MOTOR-DRIVEN DEVICES.

Application filed April 28, 1925 serial No. 709,356.

To all whom it may concern:

Be it known that I, FREDERICK H. OBER- SCHMIDT, a citizen of the United States, residin at Cleveland, in the county of Cuya ioga and State of Ohio, have invented new and useful Improvements in Electrical Controllers for Motor-Driven Devices, of whichthe following is a full, clear, concise, and exact description, reference being had to-the accompanying drawing, forming a part of this specification.

This invention relates to improvements in electrical controllers for motor driven devices and is applicable particularly to rubber mill and analogous controllers.

In control of motor driven rubber mills and other mechanisms where provision for quick stopping of "a high inertia load is essential it is customary to provide readily accessible means operable for deenergization of the driving motor and practically simul taneous application of a powerful brake.

The present invention has among its objects that of providing improved and simplified apparatus for theforegoingand other purposes.

Another object is a that of providing against energization of the motor except while the brake is released.

Another object is that of providing exceedingly simple, rugged and reliable apparatus for such purposes and whereof the electrical energy consumption for control' purposes is minimized.

Other objects and advantages will hereinafter appear.

The accompanying drawing, consisting of a single figure, illustrates diagrammatically and schematically, a proposed embodiment of the invention.

Referringto the drawing, the same illustrates roller 5, indicating a portion of a rubber mill or the like, driven by a motor 6, the latter to be suitably supplied with elec trical energy as from lines L L L lsubject to energization control as bymanually operable switch '7. Said switch is' provided with a hold-in latch 8 biased to releasing position and having electromagneticmeans comprising a coil'9 for: holding the same in latching relation subject to release upon deenergi'zation of said coil due to interrups p y 1- tage or other cause. Suitable starting means is provided for the motor, which means may preferably comprise an auto-transformer type starter as shown.

- A mechanical brake 10 having a suitable cylinder 11 is'p'rovided for the roller 5, said brake being of relatively high power to overcome rapidly the inertia of the roller and also of the rotor and associated parts assuming direct or positive drive of the for mer by the latter.

In practice the required brake-engaging force isso large as to render electromagnetic release of the brake une'conomical and hence undesirable. The brake, however, is provided with an electromagnetically engageable latch 12 for holding the same released following manual release thereof, said latch being biased out of holding relation as by a spring 13 and being provided with a coil 14: adapted when energized to project the latch into holding position against the action of said spring. Further the relation is such as to permit manual release of the brake during energization of said coil.

The energizing circuit of switch holding or latching-in coil 9 is connected as shown to be capable of energization only upon closure of switch 7. Also said circuit is provided with a normally open interlocking switch 15 to be closed and held closed upon and during released positioning of the brake.

The energizing circuit of brake release latching coil ldis arranged to be energized irrespective of the position of switch 7. V

Jointly operable safety switches 16 and 17 are arranged in the respective energizing circuits of each of said coils 9 and 14, said switches having common operating means which may preferably comprise a cradle type actuator 18 arranged above the roll 5 and within easy reach'of the operator.

Upon actuation of said cradle both of said switches 16 and 17 are adapted to open, the switch 16 deenergizing coil 9 for opening of switch 7 and deenergization of the motor, and the switch 17 similarly deener gizing coil 14 to thereby permit withdrawal of latch 12 and resultant application of the brake for quick stopping of the roller. Such pplication of the brake results in opening of switch 15,

l llowing such stopping, switch 1' cannot be electromagnctically latched in closed position except following release of the brake and consequent closure or resetting o't switch 15, such arrangement practically insitting against operation of the motor except when the brake is released. It apparent that following failure of voltage ol: the suppl lines the interlocking switch 15 also serves as described to prevent operation oi the motor except while the bralte is tully releasi-zd.

\Vhat I claim as new by Letters Patent is:

1. In a controller for motor driven rubber mills and the like provided with suitable brakes, the combination with individual electrorcsponsive means to respectively control cnergization of the motor and application ol the brake, ot' interlocking means proand desire to secure viding against electromagnetically controlled ent 'ization otthe motor except under conditions of release oi the brake.

In a controller for motor driven rubber mills and the like provided with suitable brakes, the combination with a motor circuit controlling switch having electroresponsive means adapted when energized to hold. the same in closed position and a brake having" electroresponsive means for latching}; the same in released position, of means controllable by said brake to prevent actuation of said latching-in means except during maintenance of said brake in released position.

3. In a controller for motor driven rubber mills and the like provided with suitable brakes, the combination with a switch having electroresponsive latel'iingdn means to control the motor circuit and a brake having elcct-rorcsponsive means for latching the same in released position, of voluntarily operable means for intcrruptii'lg the energizing; circuits of said clectroresponsive means to thereby cause interruption of the drive and application of the brake, said voluntarily operable means being biased to resetting position, and means associated with said braltc to require release thereof prior to energization of said latchingdn means for said switch.

4-. In a controller for motor operated rubber mills and the like, the combination with a switch to control energization of: the motor and electroresponsivc latching-in means tor said switch, of a. brake. electroresponsive means for holding the brake re leased and adapted when deenergized to cause application of the brake, a normallyopen switch arranged to control energizetion of said latching in means and operating means providing for closure of said switch upon release otthe brake and opening of the former upon application, of the latter.

In a controller for motor driven rubber mills and the like, the combinatitm with a motor circuit control'ing switch biased to open position, electroresponsive means adapted when energized to hold said switch in closed position, a manually releasable brake, a normally retracted latch and electroresponsive means adapted when energized to project said latch tor holding said brake in released position, and voluntarily operable means for simultaneously interrupting the energizing circuits (it said electroresponsive means to thereby cause interruption of the drive and application oi the brake, said voluntarily operable means being biased to resetting position for effecting automatic reenergization of said second mentioned electroresponsive means.

6. In a controller for a motor driven rubber mill or the like, the combination with a circuit for the motor, a switch biased to open position, said switch being manually operable to close said circuit, electrorespon' site means adapted when energized to hold said switch in closed position, a manually releasable brake and a latch for holding the same in released position, said latch be ing' biased into retracted posit-ion, and elect-rorcspoiuiive means adapted when energized to project said latch, said last mentioned electroresponsive means being energizable independently of said first. mentioned electroresponsive means, energization of said first mentioned means being dependent upon movement of said brake to released position.

7. In a cont-roller for a motor driven rubber mill or the like, the combination with a circuit for the motor, a switch biased to open position, said switch being manually operable to close said circuit, elect-roresponsire means adapted when energized to hold said switch in closed 11 osition, a manually releasable brake and a. latch for holding the same in released position, said latch being biased into retracted position, eleetrm'esponsivc means adapted when energized to pro ject said latch, said last mentioned electroresponsivc means being energizable independently of said first mentioned elcctroresponsive means, energization oi" said first mentioned means being dependent upon re leased positioning of said brake,- and voluntarilyoperable means for eii'ecting substantially simultaneous interruption of the 011' cnits of said electroresponsive means.

8. In a controller tor a motor driven rubber mill or the like, the combination with a circuit for the motor, a switch biased to open position, said switch being manually operable to close said circuit. clectroresponsire means adapted when energized to'hold said switch in closed position. a manually releasable brake and a. latch for holding the same in released position. said latch being i lfi l iIl Q retracted position, elcctrorespoir ltlt) lltl sive means adapted when energized to project said latch, said lastmentioned electroresponsive means being energizable inderpendently of said first mentioned electro- 5 responsive means, energization of said first mentioned means being dependent upon released positioning of said brake, and a plu- 'ralitv of normall r closed safet switches having common operating means for effecting simultaneous deenergization of said electroresponsive means.

In Witness whereof, I have hereunto subscribed my name.

FREDERICK H. OBERSOHMIDT. 

